| Parameter |
Value |
| Designation |
C/1994 N1 (Nakamura-Nishimura-Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-07-12T22:33:27.740160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
305 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-08-10.0000000 |
| e |
1.00000419 |
| q (au) |
1.140140 |
| a (au) |
-272260.819970 |
| i (deg) |
94.378024 |
| Ω (om, deg) |
158.912250 |
| ω (w, deg) |
123.071914 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.704 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.704 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.734 |
| k |
0.998 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
08:14:28.73 |
-59:15:05.6 |
HIP 40116 |
21.97 |
| 2026-05-12 12:00 |
08:14:30.13 |
-59:14:35.8 |
HIP 40116 |
22.15 |
| 2026-05-13 00:00 |
08:14:31.57 |
-59:14:06.1 |
HIP 40116 |
22.35 |
| 2026-05-13 12:00 |
08:14:33.04 |
-59:13:36.5 |
HIP 40116 |
22.57 |
| 2026-05-14 00:00 |
08:14:34.54 |
-59:13:07.0 |
HIP 40116 |
22.80 |
| 2026-05-14 12:00 |
08:14:36.08 |
-59:12:37.6 |
HIP 40116 |
23.04 |
| 2026-05-15 00:00 |
08:14:37.64 |
-59:12:08.3 |
HIP 40116 |
23.30 |
| 2026-05-15 12:00 |
08:14:39.24 |
-59:11:39.1 |
HIP 40116 |
23.56 |
| 2026-05-16 00:00 |
08:14:40.86 |
-59:11:10.1 |
HIP 40116 |
23.84 |
| 2026-05-16 12:00 |
08:14:42.52 |
-59:10:41.1 |
HIP 40116 |
24.14 |
| 2026-05-17 00:00 |
08:14:44.21 |
-59:10:12.3 |
HIP 40116 |
24.44 |
| 2026-05-17 12:00 |
08:14:45.92 |
-59:09:43.6 |
HIP 40655 |
24.33 |
| 2026-05-18 00:00 |
08:14:47.67 |
-59:09:15.0 |
HIP 40655 |
24.12 |
| 2026-05-18 12:00 |
08:14:49.45 |
-59:08:46.6 |
HIP 40655 |
23.92 |
| 2026-05-19 00:00 |
08:14:51.26 |
-59:08:18.3 |
HIP 40655 |
23.72 |
| 2026-05-19 12:00 |
08:14:53.10 |
-59:07:50.1 |
HIP 40655 |
23.52 |
| 2026-05-20 00:00 |
08:14:54.96 |
-59:07:22.1 |
HIP 40655 |
23.33 |
| 2026-05-20 12:00 |
08:14:56.86 |
-59:06:54.2 |
HIP 40655 |
23.15 |
| 2026-05-21 00:00 |
08:14:58.79 |
-59:06:26.4 |
HIP 40655 |
22.98 |
| 2026-05-21 12:00 |
08:15:00.74 |
-59:05:58.8 |
HIP 40655 |
22.81 |
| 2026-05-22 00:00 |
08:15:02.73 |
-59:05:31.3 |
HIP 40655 |
22.65 |
| 2026-05-22 12:00 |
08:15:04.74 |
-59:05:03.9 |
HIP 40655 |
22.49 |
| 2026-05-23 00:00 |
08:15:06.78 |
-59:04:36.7 |
HIP 40655 |
22.35 |
| 2026-05-23 12:00 |
08:15:08.85 |
-59:04:09.7 |
HIP 40655 |
22.20 |
| 2026-05-24 00:00 |
08:15:10.95 |
-59:03:42.7 |
HIP 40655 |
22.07 |
| 2026-05-24 12:00 |
08:15:13.07 |
-59:03:16.0 |
HIP 40655 |
21.94 |
| 2026-05-25 00:00 |
08:15:15.23 |
-59:02:49.4 |
HIP 40655 |
21.83 |
| 2026-05-25 12:00 |
08:15:17.41 |
-59:02:22.9 |
HIP 40655 |
21.71 |
| 2026-05-26 00:00 |
08:15:19.62 |
-59:01:56.6 |
HIP 40655 |
21.61 |
| 2026-05-26 12:00 |
08:15:21.85 |
-59:01:30.4 |
HIP 40655 |
21.52 |
| 2026-05-27 00:00 |
08:15:24.11 |
-59:01:04.4 |
HIP 40655 |
21.43 |
| 2026-05-27 12:00 |
08:15:26.40 |
-59:00:38.6 |
HIP 40655 |
21.35 |
| 2026-05-28 00:00 |
08:15:28.72 |
-59:00:12.9 |
HIP 40655 |
21.28 |
| 2026-05-28 12:00 |
08:15:31.06 |
-58:59:47.4 |
HIP 40655 |
21.21 |
| 2026-05-29 00:00 |
08:15:33.43 |
-58:59:22.0 |
HIP 40655 |
21.16 |
| 2026-05-29 12:00 |
08:15:35.82 |
-58:58:56.9 |
HIP 40655 |
21.11 |
| 2026-05-30 00:00 |
08:15:38.24 |
-58:58:31.8 |
HIP 40655 |
21.07 |
| 2026-05-30 12:00 |
08:15:40.69 |
-58:58:07.0 |
HIP 40655 |
21.04 |
| 2026-05-31 00:00 |
08:15:43.16 |
-58:57:42.3 |
HIP 40655 |
21.02 |
| 2026-05-31 12:00 |
08:15:45.66 |
-58:57:17.7 |
HIP 40621 |
20.88 |
| 2026-06-01 00:00 |
08:15:48.18 |
-58:56:53.4 |
HIP 40621 |
20.36 |
| 2026-06-01 12:00 |
08:15:50.73 |
-58:56:29.2 |
HIP 40621 |
19.84 |
| 2026-06-02 00:00 |
08:15:53.30 |
-58:56:05.2 |
HIP 40621 |
19.32 |